Corrosion Behavior of Stainless Steels in Crevice under Cyclic Corrosion Test- Effect of Alloying Elements -

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  • Hiraide Nobuhiko
    Research & Development Center, Nippon Steel & Sumikin Stainless Steel Corporation
  • Kajimura Haruhiko
    Research & Development Center, Nippon Steel & Sumikin Stainless Steel Corporation

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Other Title
  • 乾湿繰り返し試験におけるステンレス鋼すきま部の腐食挙動－合金元素の影響－
  • カンシツ クリカエシ シケン ニ オケル ステンレスコウスキマブ ノ フショク キョドウ : ゴウキン ゲンソ ノ エイキョウ

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Description

<p>Cyclic corrosion tests, consisting of 0.86 kmol･m‒3 NaCl solution spraying, drying, and wetting process, were conducted using a crevice-structured spot-weld specimen of ferritic stainless steels in order to investigate the effect of alloying elements on the corrosion behavior. The addition of Ni to 18Cr1Mo ferritic stainless steels was the most effective in decreasing the maximum corrosion depth in the crevice. Mo was an effective alloying element and the increase of Cr was not effective. Ni and Mo acted as effective elements decreasing the critical passive current densities and the addition of Ni was the most effective in lowering repassivation pH in acidic NaCl aqueous solutions. The result that the maximum corrosion depth decreases remarkably in the crevice could be attributed to the benefitical effect of Ni that inhibit anodic dissolution and accelerate repassivation.</p>

Journal

  • Corrosion Engineering

    Corrosion Engineering 66 (6), 214-222, 2017

    Japan Society of Corrosion Engineering

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